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Observing strain localisation processes in bio-cemented sand using x-ray imaging

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Author

  • Francesco Tagliaferri
  • Jack Waller
  • Edward Ando
  • Stephen Hall
  • Gioacchino Viggiani
  • Pierre Besuelle
  • Jason T. DeJong

Summary, in English

In-situ x-ray tomography has been used to follow deformation processes in 3D during two triaxial compression tests, one on a specimen of bio-cemented Ottawa 50-70 sand and the other on a specimen of the non-cemented sand. The global stress-strain responses show that the bio-cementation process increases the shear strength (peak deviator stress is approximately doubled), and causes the material to exhibit a linear behaviour up until peak, as well as increasing the dilatancy angle. The residual strength of the two samples is very close at large strain. Quantitative 3D digital image analysis (porosity, cement-density and strain field measurements), reveals that a dilatant shear band gradually develops pre-peak in the reference material. The cemented sample however undergoes an abrupt change of deformation mechanism at peak stress: from homogeneous deformation to localised dilatant shearing, which is associated with a local loss of cementation.

Publishing year

2011

Language

English

Pages

247-250

Publication/Series

Granular Matter

Volume

13

Document type

Journal article

Publisher

Springer

Topic

  • Mechanical Engineering

Status

Published

ISBN/ISSN/Other

  • ISSN: 1434-7636